drivers/mmc/ftsdc010_mci.c

   1 /*
   2  * Faraday MMC/SD Host Controller
   3  *
   4  * (C) Copyright 2010 Faraday Technology
   5  * Dante Su <dantesu@faraday-tech.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <part.h>
  13 #include <mmc.h>
  14
  15 #include <linux/io.h>
  16 #include <linux/errno.h>
  17 #include <asm/byteorder.h>
  18 #include <faraday/ftsdc010.h>
  19 #include "ftsdc010_mci.h"
  20
  21 #define CFG_CMD_TIMEOUT (CONFIG_SYS_HZ >> 4) /* 250 ms */
  22 #define CFG_RST_TIMEOUT CONFIG_SYS_HZ /* 1 sec reset timeout */
  23
  24 static inline int ftsdc010_send_cmd(struct mmc *mmc, struct mmc_cmd *mmc_cmd)
  25 {
  26         struct ftsdc010_chip *chip = mmc->priv;
  27         struct ftsdc010_mmc __iomem *regs = chip->regs;
  28         int ret = -ETIMEDOUT;
  29         uint32_t ts, st;
  30         uint32_t cmd   = FTSDC010_CMD_IDX(mmc_cmd->cmdidx);
  31         uint32_t arg   = mmc_cmd->cmdarg;
  32         uint32_t flags = mmc_cmd->resp_type;
  33
  34         cmd |= FTSDC010_CMD_CMD_EN;
  35
  36         if (chip->acmd) {
  37                 cmd |= FTSDC010_CMD_APP_CMD;
  38                 chip->acmd = 0;
  39         }
  40
  41         if (flags & MMC_RSP_PRESENT)
  42                 cmd |= FTSDC010_CMD_NEED_RSP;
  43
  44         if (flags & MMC_RSP_136)
  45                 cmd |= FTSDC010_CMD_LONG_RSP;
  46
  47         writel(FTSDC010_STATUS_RSP_MASK | FTSDC010_STATUS_CMD_SEND,
  48                 &regs->clr);
  49         writel(arg, &regs->argu);
  50         writel(cmd, &regs->cmd);
  51
  52         if (!(flags & (MMC_RSP_PRESENT | MMC_RSP_136))) {
  53                 for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
  54                         if (readl(&regs->status) & FTSDC010_STATUS_CMD_SEND) {
  55                                 writel(FTSDC010_STATUS_CMD_SEND, &regs->clr);
  56                                 ret = 0;
  57                                 break;
  58                         }
  59                 }
  60         } else {
  61                 st = 0;
  62                 for (ts = get_timer(0); get_timer(ts) < CFG_CMD_TIMEOUT; ) {
  63                         st = readl(&regs->status);
  64                         writel(st & FTSDC010_STATUS_RSP_MASK, &regs->clr);
  65                         if (st & FTSDC010_STATUS_RSP_MASK)
  66                                 break;
  67                 }
  68                 if (st & FTSDC010_STATUS_RSP_CRC_OK) {
  69                         if (flags & MMC_RSP_136) {
  70                                 mmc_cmd->response[0] = readl(&regs->rsp3);
  71                                 mmc_cmd->response[1] = readl(&regs->rsp2);
  72                                 mmc_cmd->response[2] = readl(&regs->rsp1);
  73                                 mmc_cmd->response[3] = readl(&regs->rsp0);
  74                         } else {
  75                                 mmc_cmd->response[0] = readl(&regs->rsp0);
  76                         }
  77                         ret = 0;
  78                 } else {
  79                         debug("ftsdc010: rsp err (cmd=%d, st=0x%x)\n",
  80                                 mmc_cmd->cmdidx, st);
  81                 }
  82         }
  83
  84         if (ret) {
  85                 debug("ftsdc010: cmd timeout (op code=%d)\n",
  86                         mmc_cmd->cmdidx);
  87         } else if (mmc_cmd->cmdidx == MMC_CMD_APP_CMD) {
  88                 chip->acmd = 1;
  89         }
  90
  91         return ret;
  92 }
  93
  94 static void ftsdc010_clkset(struct mmc *mmc, uint32_t rate)
  95 {
  96         struct ftsdc010_chip *chip = mmc->priv;
  97         struct ftsdc010_mmc __iomem *regs = chip->regs;
  98         uint32_t div;
  99
 100         for (div = 0; div < 0x7f; ++div) {
 101                 if (rate >= chip->sclk / (2 * (div + 1)))
 102                         break;
 103         }
 104         chip->rate = chip->sclk / (2 * (div + 1));
 105
 106         writel(FTSDC010_CCR_CLK_DIV(div), &regs->ccr);
 107
 108         if (IS_SD(mmc)) {
 109                 setbits_le32(&regs->ccr, FTSDC010_CCR_CLK_SD);
 110
 111                 if (chip->rate > 25000000)
 112                         setbits_le32(&regs->ccr, FTSDC010_CCR_CLK_HISPD);
 113                 else
 114                         clrbits_le32(&regs->ccr, FTSDC010_CCR_CLK_HISPD);
 115         }
 116 }
 117
 118 static int ftsdc010_wait(struct ftsdc010_mmc __iomem *regs, uint32_t mask)
 119 {
 120         int ret = -ETIMEDOUT;
 121         uint32_t st, timeout = 10000000;
 122         while (timeout--) {
 123                 st = readl(&regs->status);
 124                 if (!(st & mask))
 125                         continue;
 126                 writel(st & mask, &regs->clr);
 127                 ret = 0;
 128                 break;
 129         }
 130
 131         if (ret){
 132                 debug("ftsdc010: wait st(0x%x) timeout\n", mask);
 133         }
 134
 135         return ret;
 136 }
 137
 138 /*
 139  * u-boot mmc api
 140  */
 141 static int ftsdc010_request(struct udevice *dev, struct mmc_cmd *cmd,
 142         struct mmc_data *data)
 143 {
 144         struct mmc *mmc = mmc_get_mmc_dev(dev);
 145         int ret = -EOPNOTSUPP;
 146         uint32_t len = 0;
 147         struct ftsdc010_chip *chip = mmc->priv;
 148         struct ftsdc010_mmc __iomem *regs = chip->regs;
 149
 150         if (data && (data->flags & MMC_DATA_WRITE) && chip->wprot) {
 151                 printf("ftsdc010: the card is write protected!\n");
 152                 return ret;
 153         }
 154
 155         if (data) {
 156                 uint32_t dcr;
 157
 158                 len = data->blocksize * data->blocks;
 159
 160                 /* 1. data disable + fifo reset */
 161                 dcr = 0;
 162 #ifdef CONFIG_FTSDC010_SDIO
 163                 dcr |= FTSDC010_DCR_FIFO_RST;
 164 #endif
 165                 writel(dcr, &regs->dcr);
 166
 167                 /* 2. clear status register */
 168                 writel(FTSDC010_STATUS_DATA_MASK | FTSDC010_STATUS_FIFO_URUN
 169                         | FTSDC010_STATUS_FIFO_ORUN, &regs->clr);
 170
 171                 /* 3. data timeout (1 sec) */
 172                 writel(chip->rate, &regs->dtr);
 173
 174                 /* 4. data length (bytes) */
 175                 writel(len, &regs->dlr);
 176
 177                 /* 5. data enable */
 178                 dcr = (ffs(data->blocksize) - 1) | FTSDC010_DCR_DATA_EN;
 179                 if (data->flags & MMC_DATA_WRITE)
 180                         dcr |= FTSDC010_DCR_DATA_WRITE;
 181                 writel(dcr, &regs->dcr);
 182         }
 183
 184         ret = ftsdc010_send_cmd(mmc, cmd);
 185         if (ret) {
 186                 printf("ftsdc010: CMD%d failed\n", cmd->cmdidx);
 187                 return ret;
 188         }
 189
 190         if (!data)
 191                 return ret;
 192
 193         if (data->flags & MMC_DATA_WRITE) {
 194                 const uint8_t *buf = (const uint8_t *)data->src;
 195
 196                 while (len > 0) {
 197                         int wlen;
 198
 199                         /* wait for tx ready */
 200                         ret = ftsdc010_wait(regs, FTSDC010_STATUS_FIFO_URUN);
 201                         if (ret)
 202                                 break;
 203
 204                         /* write bytes to ftsdc010 */
 205                         for (wlen = 0; wlen < len && wlen < chip->fifo; ) {
 206                                 writel(*(uint32_t *)buf, &regs->dwr);
 207                                 buf  += 4;
 208                                 wlen += 4;
 209                         }
 210
 211                         len -= wlen;
 212                 }
 213
 214         } else {
 215                 uint8_t *buf = (uint8_t *)data->dest;
 216
 217                 while (len > 0) {
 218                         int rlen;
 219
 220                         /* wait for rx ready */
 221                         ret = ftsdc010_wait(regs, FTSDC010_STATUS_FIFO_ORUN);
 222                         if (ret)
 223                                 break;
 224
 225                         /* fetch bytes from ftsdc010 */
 226                         for (rlen = 0; rlen < len && rlen < chip->fifo; ) {
 227                                 *(uint32_t *)buf = readl(&regs->dwr);
 228                                 buf  += 4;
 229                                 rlen += 4;
 230                         }
 231
 232                         len -= rlen;
 233                 }
 234
 235         }
 236
 237         if (!ret) {
 238                 ret = ftsdc010_wait(regs,
 239                         FTSDC010_STATUS_DATA_END | FTSDC010_STATUS_DATA_CRC_OK);
 240         }
 241
 242         return ret;
 243 }
 244
 245 static int ftsdc010_set_ios(struct udevice *dev)
 246 {
 247         struct mmc *mmc = mmc_get_mmc_dev(dev);
 248         struct ftsdc010_chip *chip = mmc->priv;
 249         struct ftsdc010_mmc __iomem *regs = chip->regs;
 250
 251         ftsdc010_clkset(mmc, mmc->clock);
 252
 253         clrbits_le32(&regs->bwr, FTSDC010_BWR_MODE_MASK);
 254         switch (mmc->bus_width) {
 255         case 4:
 256                 setbits_le32(&regs->bwr, FTSDC010_BWR_MODE_4BIT);
 257                 break;
 258         case 8:
 259                 setbits_le32(&regs->bwr, FTSDC010_BWR_MODE_8BIT);
 260                 break;
 261         default:
 262                 setbits_le32(&regs->bwr, FTSDC010_BWR_MODE_1BIT);
 263                 break;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int ftsdc010_get_cd(struct udevice *dev)
 270 {
 271         struct mmc *mmc = mmc_get_mmc_dev(dev);
 272         struct ftsdc010_chip *chip = mmc->priv;
 273         struct ftsdc010_mmc __iomem *regs = chip->regs;
 274         return !(readl(&regs->status) & FTSDC010_STATUS_CARD_DETECT);
 275 }
 276
 277 static int ftsdc010_get_wp(struct udevice *dev)
 278 {
 279         struct mmc *mmc = mmc_get_mmc_dev(dev);
 280         struct ftsdc010_chip *chip = mmc->priv;
 281         struct ftsdc010_mmc __iomem *regs = chip->regs;
 282         if (readl(&regs->status) & FTSDC010_STATUS_WRITE_PROT) {
 283                 printf("ftsdc010: write protected\n");
 284                 chip->wprot = 1;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int ftsdc010_init(struct mmc *mmc)
 291 {
 292         struct ftsdc010_chip *chip = mmc->priv;
 293         struct ftsdc010_mmc __iomem *regs = chip->regs;
 294         uint32_t ts;
 295
 296         chip->fifo = (readl(&regs->feature) & 0xff) << 2;
 297
 298         /* 1. chip reset */
 299         writel(FTSDC010_CMD_SDC_RST, &regs->cmd);
 300         for (ts = get_timer(0); get_timer(ts) < CFG_RST_TIMEOUT; ) {
 301                 if (readl(&regs->cmd) & FTSDC010_CMD_SDC_RST)
 302                         continue;
 303                 break;
 304         }
 305         if (readl(&regs->cmd) & FTSDC010_CMD_SDC_RST) {
 306                 printf("ftsdc010: reset failed\n");
 307                 return -EOPNOTSUPP;
 308         }
 309
 310         /* 2. enter low speed mode (400k card detection) */
 311         ftsdc010_clkset(mmc, 400000);
 312
 313         /* 3. interrupt disabled */
 314         writel(0, &regs->int_mask);
 315
 316         return 0;
 317 }
 318
 319 int ftsdc010_probe(struct udevice *dev)
 320 {
 321         struct mmc *mmc = mmc_get_mmc_dev(dev);
 322         return ftsdc010_init(mmc);
 323 }
 324
 325 const struct dm_mmc_ops dm_ftsdc010_ops = {
 326         .send_cmd       = ftsdc010_request,
 327         .set_ios        = ftsdc010_set_ios,
 328         .get_cd         = ftsdc010_get_cd,
 329         .get_wp         = ftsdc010_get_wp,
 330 };
 331
 332 void ftsdc_setup_cfg(struct mmc_config *cfg, const char *name, int buswidth,
 333                      uint caps, u32 max_clk, u32 min_clk)
 334 {
 335         cfg->name = name;
 336         cfg->f_min = min_clk;
 337         cfg->f_max = max_clk;
 338         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 339         cfg->host_caps = caps;
 340         if (buswidth == 8) {
 341                 cfg->host_caps |= MMC_MODE_8BIT;
 342                 cfg->host_caps &= ~MMC_MODE_4BIT;
 343         } else {
 344                 cfg->host_caps |= MMC_MODE_4BIT;
 345                 cfg->host_caps &= ~MMC_MODE_8BIT;
 346         }
 347         cfg->part_type = PART_TYPE_DOS;
 348         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 349 }
 350
 351 int ftsdc010_bind(struct udevice *dev, struct mmc *mmc, struct mmc_config *cfg)
 352 {
 353         return mmc_bind(dev, mmc, cfg);
 354 }